No mistake!?!?

Hi everyone!,

Someone says that this calculation is not correct, for you how is it?

time derivative of a vector.jpg

23-Emerald I

There is a "Del" operator (or "grad") in Mathcad 15:

You get it by typing "Ctrl,Shift,G"

The work's already been done!

Author

21-Topaz II

Oh! what a beautiful discovery !!!

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